Messages in this thread | | | Date | Sat, 04 Sep 1999 00:34:23 +0200 | From | Manfred Spraul <> | Subject | Re: CONFIG_BIGMEM and rawio |
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"Stephen C. Tweedie" wrote: > There are two different ways forward here. > > The quick and easy hack to get raw IO working is to do precisely what > the swap code does. That works fully synchronously, so it's easy to do.
Since bounce_user_kiobuf() is required anyway, I would prefer this aproach: it looks like a 2 line fix.
> [ or: ] > The harder problem is to > hide it inside ll_rw_block(), which we _do_ want to do if we move the > page cache to high memory.
Is that planed for 2.[34]? If not, then I'd wait: I don't like a large in-advance solution for a not exactly defined problem [possible OOM problems]
Note that currently, kswapd automagically ignores pages from bigmem if it cannot allocate the bounce buffer [mm/vmscan.c, line 159]. It will be difficult to do that in ll_rw_block().
-- Manfred
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